no court in FLA is going to allow you to just terminate the rights of the other parent, especially since he never had to do anything. until ordered by the court, he doesn't have to see or pay for the kids.
you cant terminate the rights and responsibilities without having someone else ((step parent)) willing to take over the responsibility.
and you are trying to terminate rights on a child that hasn't even been born yet is ridiculous. and if that isn't the case, then you see why it is crucial to keep all questions together in the same thread.
instead of trying to move a mountain, move a rock by suing him for child support as well as visitation.